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Session Overview
DGE Rollout Side Event
Tuesday, 18/Oct/2022:
2:00pm - 3:45pm

Session Chair: Estelle Petitclerc, Geological Survey of Belgium, Belgium
Location: A06

Session Abstract

North-West Europe (NWE) has to reduce CO2 emissions. One major source for the latter is the production of electricity and heat by burning fossil fuels. Replacing this process through the implementation of deep geothermal energy (DGE) could significantly aid to the reduction of CO2 emissions and hence support a sustainable energy generation. However, the exploration of hydrothermal DGE targets in most NWE regions requires comprehensive investigation and specific geologic and engineering expertise considering the generally complex setting including strongly faulted and folded horizons of highly permeable carbonate rocks, in the border area consisting of Germany, France, the Netherlands and Belgium.

It is the objective of DGE-ROLLOUT to promote the use of DGE and also to reduce CO2 emissions through the initiation and optimization of particular pilot projects. This is aimed to be achieved using a multi-disciplinary approach including the improvement of the current insufficient data situation, the compilation and development of innovative decision and exploration strategies, as well as the optimization of existing DGE manifestations. Therefore, the DGE-ROLLOUT project comprises three work packages: Mapping and networking (WP T1), Decision and exploration support (WP T2) and Testing for production optimization (WP T3).

WP T1 seeks to provide a reconciled and common knowledge baseline for the DGE market development in the project area, including the preparation of a transnationally harmonised depth and thickness map of the currently targeted Lower Carboniferous carbonate reservoir rocks. WP T2 intends to fill existing information gaps by acquiring transnational 2D seismic surveys, conducting drilling operations, reprocessing vintage 2D seismic data, and producing a variety of subsurface 2D and 3D models. WP T3 aims to increase the efficiency of existing geothermal systems, and to implement new or improved production techniques in the fields of reservoir behaviour, cascading systems and thermal energy storage.

Besides the Geological Survey of North Rhine-Westphalia as the lead partner, the DGE-ROLLOUT project partners include the national geological surveys of Belgium, France and the Netherlands, as well as industry partners (DMT GmbH & Co. KG; Energie Beheer Nederland B.V.; RWE Power AG) and research institutions (Fraunhofer Institution for Energy Infrastructures and Geothermal Systems; Technical University Darmstadt; Flemish Institute for Technological Research).

Our Side Event in the course of the European Geothermal Congress 2022 will provide an overview of the work that has been undertaken throughout the DGE-ROLLOUT project’s lifetime (Oct 2018 – Oct 2023), present major results that have been achieved, and give an outline of the approach to foster the development of DGE for both small- and large-scale infrastructures. Our Side Event will be subdivided into four thematic blocks comprising 1) Mapping the DGE Potential of North-West Europe, 2) Supporting DGE Exploration, 3) DGE Case Studies and 4) Upscaling DGE for Industry.

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DGE Rollout Side Event: 1

From geological structure to geothermal potentiel assessment of the Dinantian limestones in northern France.

Chrystel Dezayes, Frédéric Lacquement, Laure Capar, Alexandre Stopin, Elisa Toussaint

BRGM, France

DGE Rollout is a European INTERREG project with mission to reduce the energy related CO2 emission in the North-West Europe using deep geothermal energy. The area scoped by the project covers Germany, Netherland, Belgium and France and the targeted potential deep geothermal reservoir is the deformed carbonates of the Dinantian. In the northern France, the variscan front affects the Dinantian limestones and caused big thrusting like the Midi fault as well as complex deformations. Geothermal wells drilled in the 80’s and distant by roughly 20km hit very different reservoir characteristics though they were in the same formation. The highly complex geology caused such unpredictable outcome in reservoir properties and therefore limited the geothermal exploitation development of the area. To perform geothermal exploration in Northern France, understanding of the deep geological structures and better knowledge of the Dinantian, will be required

To that end, we conduct a comprehensive geological and geophysical study of the deep-seated structure of the Dinantian reservoir in the northern France with a focus between Lens and Maubeuge, where geothermal energy could answer the significant need for energy. First, a detailed stratigraphic chart is produced from the literature, shared and homogenized with the other country partner. With such a chart, representing the different logs at their respective location in space, a first concept of the structures at depth can be obtained.

Secondly vintage seismic lines acquired in the 70’s to obtain geometrical information for the carboniferous terrains were reprocessed in pre stack depth migration and in true amplitude fashion. This reprocessing has allowed performing an accurate geological and structural interpretation of the seismic lines aided by the stratigraphic chart.

This reprocessing in true amplitude and the interpretation were followed by a quantitative analysis allowing for the derivation of reservoir properties away from well control. Unfortunately, well data are very few and the vintage/quality of the data meant that the characterization of the reservoir carries many uncertainties. Nonetheless, the Dinantian structure and composition has been specified and a first estimation of the areas with favorable resources could be obtained. The best targeted areas where the geothermal exploitation could be developed in the future are then determined by combining the result of stakeholder analyses and by overlapping the location of these potential deep geothermal resource with the surface energy requirements. This defines the hot spot, where the future exploration will have to focus.

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